package com.zhongying.jf.util;

public class ConvertUtil {


        public static String bytesToHexString(byte[] src){
            StringBuilder stringBuilder = new StringBuilder("");
            if (src == null || src.length <= 0) {
                return null;
            }
            for (int i = 0; i < src.length; i++) {
                int v = src[i] & 0xFF;
                String hv = Integer.toHexString(v);
                if (hv.length() < 2) {
                    stringBuilder.append(0);
                }
                stringBuilder.append(hv);
            }
            return stringBuilder.toString();
        }

        public static byte[] hexStringToBytes(String hexString) {
            if (hexString == null || hexString.equals("")) {
                return null;
            }
            hexString = hexString.toUpperCase();
            int length = hexString.length() / 2;
            char[] hexChars = hexString.toCharArray();
            byte[] d = new byte[length];
            for (int i = 0; i < length; i++) {
                int pos = i * 2;
                d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));
            }
            return d;
        }

        public static String stringToHexString(String str) {
            return bytesToHexString(str.getBytes());
        }

        public static String hexStringtoString(String hexString) {
            return new String(hexStringToBytes(hexString));
        }

        private static byte charToByte(char c) {
            return (byte) "0123456789ABCDEF".indexOf(c);
        }
    }
